Enhancing Cation Diffusion and Suppressing Anion Diffusion via Lewis-Acidic Polymer Electrolytes

Savoie, Brett M.; Webb, Michael A.; Miller, Thomas F.

doi:10.1021/acs.jpclett.6b02662

Title: Enhancing Cation Diffusion and Suppressing Anion Diffusion via Lewis-Acidic Polymer Electrolytes

Journal Article · Wed Jan 11 00:00:00 EST 2017 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.6b02662· OSTI ID:1483836

Savoie, Brett M. ^[1]; Webb, Michael A. ^[2];

^[2]

California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering
California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Chemistry and Chemical Engineering

Solid polymer electrolytes (SPEs) have the potential to increase both the energy density and stability of lithium-based batteries, but low Li⁺ conductivity remains a barrier to technological viability. SPEs are designed to maximize Li⁺ diffusivity relative to the anion while maintaining sufficient salt solubility. It is thus remarkable that poly(ethylene oxide) (PEO), the most widely used SPE, exhibits Li⁺ diffusivity that is an order of magnitude smaller than that of typical counterions at moderate salt concentrations. In this paper, we show that Lewis-basic polymers like PEO favor slow cation and rapid anion diffusion, while this relationship can be reversed in Lewis-acidic polymers. Using molecular dynamics, polyboranes are identified that achieve up to 10-fold increases in Li⁺ diffusivities and significant decreases in anion diffusivities, relative to PEO in the dilute-ion regime. These results illustrate a general principle for increasing Li⁺ diffusivity and transference number with chemistries that exhibit weaker cation and stronger anion coordination.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231

OSTI ID:: 1483836

Journal Information:: Journal of Physical Chemistry Letters, Vol. 8, Issue 3; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 93 works

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